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Maintenance Description
Issue 3 June 2000
9-23
Tests
9
Transmission Tests
9
Technicians can use the DDM-2000 FiberReach Multiplexer internal testing
capabilities for installation and manual troubleshooting. DS1 and DS3 test signal
generators and detectors are integrated in the system, eliminating the need for
external test equipment to do transmission testing.
The DDM-2000 FiberReach Multiplexer lets technicians test specific signals and
system components. For example, technicians can manually enable the integrated
test signal generators and detectors for a DS1/DS3 low-speed interface. Signal
tests can be run selectively in the multiplex or demultiplex direction. Refer to the
test-trmsn
-
t1
commands in Chapter 11, "Commands and Reports."
Beginning with FiberReach Release 3.1, the
test-trmsn
-
t3
command is
allowed ONLY if the shelf is equipped with 28-type OLIUs in Main and DS3 circuit
packs in the Function Units slots. Beginning with FiberReach Release 4.0, the
test-trmsn
-
t3
command is also allowed if the shelf is equipped with 29-type
OLIUs in Main and DS3 circuit packs in the Function Units slots. Refer to the
test-trmsn
-
t3
commands in Chapter 11, "Commands and Reports," for details.
Operations Interface Tests
9
The DDM-2000 FiberReach Multiplexer provides tests for LED indicators, office
alarms, and the system controller. Refer to the
test-led
,
test-alm
, and
test-sysctl
commands in Chapter 11, "Commands and Reports."
Performance Monitoring
9
The DDM-2000 FiberReach Multiplexer uses performance monitoring (PM) to
support proactive maintenance of the network and tariffed service performance
verification. Proactive maintenance refers to the process of detecting degrading
conditions not severe enough to initiate protection switching or alarming, but
indicative of an impending hard or soft failure. Hard and soft failures result in
reactive maintenance.
Proactive maintenance consists of monitoring performance parameters
associated with the SONET sections, lines, and paths within the SONET network.
Table 9-1 lists the SONET performance parameters monitored by DDM-2000
systems. These parameters are thresholded to indicate degraded performance.
When a performance-monitoring threshold is crossed, it is reported to the OS as a
threshold crossing alert (TCA). With TL1/X.25, all threshold crossings associated
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